The EPIC Air™ Combat Helmet Liner System takes comfort and protection to a whole new level. The system features a 1/2" thick base line Zorbium® impact liner with integrated air channels and customizable comfort pads in two thicknesses: thin at 1/8" and thick at 1/4". EPIC Air™ is designed to fit most styles of ground combat helmets and is compatible with all styles of communications headsets. The EPIC Air™ is available in two sizes: Size 1 (M/L) and size 2 (XL). Be sure to select the size that matches your helmet shell size. Velcro® brand hook disks not included.